Abstract
This study was carried out within Ihiebe Ogben community in Akoko Edo LGA, Nigeria to investigate the ground water potential of the Basement Complex rocks using Vertical Electrical Sounding (VES) that deploys Schlumberger Array configuration. Evaluation of hydrogeological parameters shows fractured/ weathered basement thickness, resistivity values of the fractured basement, overburden thickness and basement relief having values between 1.5-7.9m, 64.5-503.9 Ωm, 5.2-15.7m and 136.8-160.7m respectively. Prospectivity ranking map was generated from these parameters and was used to rank the area around the VES stations. The results show that the most prospective areas with the highest ranking of 8,7 and 6 correspond to areas around VES station 6,1 and 2 respectively, restricted to the Eastern – Northwestern region of the study area.Keywords: Groundwater, Vertical Electrical Sounding, Fractured basement, prospectively ranking
Highlights
The ease of developing groundwater in Nigeria is restricted by the fact that most part of the country is underlain by Basement Complex rocks. (Kazeem,2007)
The highest groundwater yield in such terrains are found in areas where thick overburden overlies fractured zones; these zones are often characterized by relatively low resistivity values (Olorunfemi et al, 1990)
Four geoelectric layers were interpreted applying both partial curve matching and computer software iterative technique (Table 1). These layers correspond to the top soil, clay, weathered/fractured basement and fresh basement typical of the geological layering characteristics of the basement terrain
Summary
The ease of developing groundwater in Nigeria is restricted by the fact that most part of the country is underlain by Basement Complex rocks. (Kazeem,2007). Various geophysical methods have been applied successfully to explore for ground water in basement terrains Some of these methods include electrical, magnetic, electromagnetic etc. The study area is underlain by Precambrian Basement Complex rocks, characterized by low porosity and permeability. The highest groundwater yield in such terrains are found in areas where thick overburden overlies fractured zones; these zones are often characterized by relatively low resistivity values (Olorunfemi et al, 1990). Locations of such zones are valuable sites to place wells for portable groundwater production devoid of pollutants (Alabi et al, 2010). The need to provide portable water sources for Ihievbe Ogben community, to reduce their adverse health exposure level constitutes the objevtive of this study
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